Medically reviewed by Eric L. Giang, DO
Every summer in Modesto, the pools fill up. Club teams, high school programs, and masters swimmers squeeze in laps before the Central Valley heat takes over. By August, some of those swimmers end up in my office describing the same pattern. The shoulder aches after practice, then during practice, then at night. That pattern has a name, swimmer’s shoulder, and in my experience it’s one of the more fixable problems an overhead athlete can have. The catch is addressing it before the damage piles up. In this post, I’ll walk through why swimmer’s shoulder develops, why I treat it as a whole-body problem, and what I do to get swimmers back in the water.
Key Takeaways
- Swimmer’s shoulder is an umbrella term for overuse pain in swimmers and other overhead athletes, most commonly involving the rotator cuff tendons, the bursa, or a joint that has become too loose.
- Pain that shows up earlier in each practice, or starts waking you at night, is a signal to cut back and get evaluated.
- Many swimmers recover without surgery through physical therapy focused on the rotator cuff, the shoulder blade muscles, and stroke mechanics.
- Surgery is generally reserved for structural problems, such as a labral tear or instability, that don’t improve with rehabilitation.
What Is Swimmer’s Shoulder?
Swimmer’s shoulder isn’t a single diagnosis. It’s a catch-all term for shoulder pain caused by the repetitive overhead motion of swimming, and it can involve several structures at once.
The most frequent culprit is an irritated rotator cuff. These four muscles and tendons keep the ball of the shoulder centered in its socket. When they get pinched or overworked, they become inflamed and painful. The fluid-filled sac above them can get irritated too, a condition called subacromial bursitis.
Laxity is the other piece. Swimmers need a lot of shoulder mobility to be fast. Over years of training, the capsule and ligaments that hold the joint together can stretch. A shoulder that’s a little too loose forces the rotator cuff to work harder to keep the ball centered. Once the cuff fatigues, the ball may drift and irritate the surrounding tissue.
Why Overhead Athletes Break Down
A competitive swimmer can take tens of thousands of strokes in a single training week. Each one moves the shoulder through a wide arc under load. Few joints in the body are asked to do that much work with that little rest.
A handful of factors can push a healthy shoulder past what it can handle:
- Sudden jumps in yardage. Adding distance too quickly, especially early in a season, gives the tendons less time to adapt.
- Tired shoulder blade muscles. When the muscles that control the scapula fatigue, the shoulder blade stops moving the way it should. That narrows the space the rotator cuff passes through.
- Stroke flaws. Crossing the midline on hand entry, a dropped elbow, or breathing only to one side can concentrate stress on one shoulder.
Swimmers aren’t the only ones at risk. Volleyball players, tennis players, and baseball pitchers place similar demands on the shoulder, and the breakdown looks much the same. If I had to name one driver above the rest, it would be training load that outpaces conditioning. The shoulder rarely fails because of one bad practice.
Recognizing the Warning Signs
Swimmer’s shoulder builds gradually. It starts as soreness after a hard set, then creeps into the warm-up, then lingers into the next day. Three signs carry the most weight with me.
The first is pain that arrives earlier in each workout. If your shoulder now hurts in the first few hundred yards, the tissue isn’t recovering between sessions.
The second is night pain. Pain that wakes you up, particularly when you roll onto that side, suggests the inflammation has moved beyond simple soreness.
The third is a clunking or slipping sensation. A shoulder that seems to shift partway out of place may point to shoulder instability or a labral problem. That changes the treatment plan.
My stance here is simple: I’d much rather see a swimmer at the soreness stage than after three weeks of swimming through pain. If the shoulder dislocates or you can’t move the arm after a fall or collision, get seen right away rather than waiting for an appointment.
How I Evaluate a Swimmer’s Shoulder
During an evaluation, I test rotator cuff strength, check for signs of impingement, and measure how much the joint shifts in each direction. I also watch the shoulder blade as the arm goes up and comes down. A scapula that wings or hitches is one of the clearest clues I get.
As a DO, I was trained to look at the body as a connected system. Swimmers show why that matters. I check thoracic spine mobility, core strength, and hip control, because weakness in any of those links can show up in the stroke. A swimmer with a stiff upper back, for instance, may crank harder through the shoulder to get the same reach.
X-rays help rule out bony problems. When I suspect a labral tear or more significant tendon damage, an MRI gives a clearer picture of the soft tissue.
I also ask a lot of questions about training. How much yardage? What changed in the last month? Are you using hand paddles? A good part of the diagnosis comes from the training log, not the exam table.
What I See in My Patients
In my Modesto practice, swimmer’s shoulder shows up in two fairly distinct groups.
The first is high school and club swimmers, frequently right after a big jump in volume. Think the start of a new season or a summer schedule with doubles. They’re flexible and strong in the water, but the small muscles that stabilize the shoulder blade haven’t kept pace.
The second group is adults. Masters swimmers, triathletes, and quite a few patients who took up lap swimming because running bothered their knees. Their tendons have less tolerance for a sudden increase in distance. Some already have early rotator cuff wear they didn’t know about.
Nearly all of them tried to swim through it first. During my shoulder and elbow fellowship at the Carrell Clinic in Dallas, I trained alongside physicians who cared for the Dallas Cowboys and Dallas Mavericks. One lesson from that time has stayed with me. Elite athletes usually get evaluated early, before a nagging problem becomes a structural one. High school swimmers and weekend triathletes deserve that same approach.
My Approach to Treatment
I start conservatively, because most swimmers improve without an operation. The goal is to calm the irritated tissue and then fix the mechanics that caused it.
I rarely pull a swimmer out of the water completely. Instead, I cut yardage and remove the strokes or drills that provoke pain. Hand paddles get set aside for a while, and kick sets help maintain conditioning. Complete rest may feel productive, but it can leave the shoulder deconditioned when training resumes.
Physical therapy is the foundation. A good program strengthens the rotator cuff and scapular stabilizers and restores flexibility in the back of the shoulder. It also builds core strength, so the power in the stroke doesn’t all come from the arm. I encourage swimmers to loop in their coach too. A small change in hand entry or breathing pattern can take a lot of stress off the joint.
When pain is blocking progress in rehab, a cortisone injection into the inflamed bursa can calm things down. I use these sparingly, because repeated injections carry their own risks to the tendon. For some partial-thickness rotator cuff tears, a PRP injection may be worth discussing.
Surgery enters the conversation only when there’s a clear structural problem, such as a labral tear or instability that hasn’t responded to a fair trial of rehab. These repairs can be performed arthroscopically through small incisions.
Getting Back in the Water
Recovery depends on what’s driving the pain. For milder tendon irritation, some swimmers can keep training at reduced volume throughout rehab. When instability is part of the picture, several months of dedicated physical therapy is a more realistic expectation. After arthroscopic stabilization surgery, a return to full activity commonly takes six months to a year.
Before a full return, I look for pain-free motion, strength that matches the other side, and a stroke that holds up under fatigue. From there, yardage builds back in steps.
Prevention matters just as much once you’re back. A consistent dryland program, breathing to both sides, gradual increases in distance, and real rest days all help protect the shoulder. I’d put dryland work on the same level as time in the pool, not as an afterthought.
Summary
Swimmer’s shoulder is overuse pain, usually rooted in the rotator cuff, the bursa, or a shoulder that has become too loose. It grows out of training load and mechanics more than any single injury. Pain earlier in practice, night pain, or a slipping sensation all deserve attention. Most swimmers get better with modified training, targeted physical therapy, and stroke adjustments, while surgery stays reserved for clear structural problems.
If you or your swimmer has shoulder pain that’s showing up earlier in practice or waking you at night, cut back the yardage and get it evaluated before it costs a season. Call my office at (209) 577-1411 or request an appointment online.
Frequently Asked Questions
Can I keep swimming with swimmer’s shoulder?
In many cases, yes, at reduced volume. I prefer to modify training rather than stop it entirely, by cutting yardage, removing painful strokes, and adding kick sets. Pain that’s worsening or waking you at night is a reason to stop and get evaluated first.
Is swimmer’s shoulder the same as a rotator cuff tear?
Not usually. Swimmer’s shoulder most commonly involves irritation of the rotator cuff tendons and bursa rather than a full tear. Long-standing overuse can contribute to partial tears, though, which is one reason I don’t recommend ignoring persistent pain.
Will I need surgery for swimmer’s shoulder?
Most swimmers don’t. Surgery is generally considered only when a structural problem, like a labral tear or instability, hasn’t improved after a fair trial of physical therapy.
How long does it take to recover from swimmer’s shoulder?
It depends on the cause. Mild tendon irritation may allow continued training at lower volume during rehab. Instability often calls for several months of physical therapy. After arthroscopic stabilization surgery, a return to full activity can take six months to a year.
Can breathing to one side cause shoulder pain?
It can play a role. Breathing only to one side may change body roll and load one shoulder more than the other. Learning to breathe bilaterally is one of the stroke adjustments I frequently discuss with swimmers and their coaches.
